im on mission of helm-although im doing chapter 3 at present it is a past mission i was previously too weak to do.also whilst im doing this mission im supposed to find this actor and recover his gem-i have found the secret entrance in the sewers and have been attacked by ulthalids and mind flayers-my question is how do i stop myself from being dire charmed/held and stunned?i have cast free flow on myself-protection from magic but to no avail?also another question yoshimo has dissapeared when i removed him from my team-rather than normally stating i will wait here?i.e copper cornet-anybody any suggestions.pls help im getting rather annoyed at this sewer mission.
thx

Actually, you are in the wrong secret entrance of the sewers. If you keep walking around the top left, you will find another hidden entrance. Up there is where you will find the next step in the quest to find the actor.

Yoshimo should be in the copper coronet, quite near the "lower entrance". Illithids and their kin attack with psionics not magic so protection from magic spells are ineffective. Chaotic Commands is the best choice but watch the duration, you will need a few (Minor spoiler ahead).
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In terms of equipment you might find clearing the illithids out to be worth your while.